AAV Adeno-Associated Virus AE Adverse Event AESI Adverse Event of Special Interest BLA Biologics License Application CI Confidence Interval DMD Duchenne Muscular Dystrophy FDA Food and Drug Administration IR Information Request ISE Integrated Summary of Efficacy ISS Integrated Summary of Safety ITT Intent-to-Treat IV Intra-Venous LSM Least Squares Mean MAR Missing At Random mITT Modified Intent-to-Treat MMRM Mixed Model for Repeated Measures MNAR Missing Not At Random MWR Meter Walk/Run NSAA North Star Ambulatory Assessment PROMIS Patient-Reported Outcomes Measurement Information System REML Restricted Maximum Likelihood SAE Serious Adverse Event SAP Statistical Analysis Plan SAS Statistical Analysis System sBLA Supplemental Biologics License Application SE Standard Error SV95C Stride Velocity 95th Centile TEAE Treatment-Emergent Adverse Event